Transmission and reduction of aerosols in classrooms using air purifier systems.

Transmission and reduction of aerosols in classrooms using air purifier systems.
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使用空气净化器系统在教室中传播和减少气溶胶。

DOI:
10.1063/5.0044046
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发表时间:
2021-03
期刊:
Physics of fluids (Woodbury, N.Y. : 1994)
影响因子:
--
通讯作者:
Janoske U
Janoske U
中科院分区:
其他
文献类型:
--
作者:
Burgmann S;Janoske U

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作为一种空气传播的呼吸道疾病,SARS-CoV-2(COVID-19)引发了一系列悬而未决的问题:如何在教室里教学以及如何降低感染风险,例如,通过使用空气净化器系统。在这项研究中,气溶胶在教室中的传输进行了数值分析和实验。在配备有空气净化器系统的教室中的气溶胶浓度用气溶胶光谱仪(光学粒度仪,TSI Incorporated)在不同位置测量。监测气溶胶浓度的瞬时降低,气溶胶浓度由气溶胶发生器(癸二酸二乙基己酯雾化器,检测到的粒径范围为0.3 - 10 μm)人工产生。实验结果被用来验证使用开源计算流体动力学代码OpenFOAM®(版本6)的教室的数值模拟模型。利用数值模拟模型,对室内有感染者的不同场景进行了分析,结果表明,空气净化器系统可以显著减少室内空气中的颗粒物,这取决于感染者的位置。该系统可以支持额外的通风策略,特别是在寒冷的季节。
SARS-CoV-2 (COVID-19) as an airborne respiratory disease led to a bunch of open questions: how teaching in classrooms is possible and how the risk of infection can be reduced, e.g., by the use of air purifier systems. In this study, the transmission of aerosols in a classroom is analyzed numerically and experimentally. The aerosol concentration in a classroom equipped with an air purifier system was measured with an aerosol spectrometer (optical particle sizer, TSI Incorporated) at different locations. The transient reduction of the aerosol concentration, which was artificially generated by an aerosol generator (di-ethyl hexyl sebacate-atomizer, detected particle size ranging from 0.3 to 10 μm), was monitored. The experimental results were used to validate a numerical simulation model of the classroom using the Open Source Computational Fluid Dynamics code OpenFOAM® (version 6). With the numerical simulation model, different scenarios with infected persons in the room have been analyzed, showing that the air purifier system leads to a significant reduction of airborne particles in the room dependent on the location of the infected person. The system can support additional ventilation strategies with fresh air, especially in cold seasons.
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